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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
   13:  *
   14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   15:  * copies of the Software, and permit persons to whom the Software is
   16:  * furnished to do so, under the terms of the COPYING file.
   17:  *
   18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   19:  * KIND, either express or implied.
   20:  *
   21:  ***************************************************************************/
   22: 
   23: #include "curl_setup.h"
   24: 
   25: #include <curl/curl.h>
   26: 
   27: #include "curl_memrchr.h"
   28: #include "curl_memory.h"
   29: 
   30: /* The last #include file should be: */
   31: #include "memdebug.h"
   32: 
   33: #ifndef HAVE_MEMRCHR
   34: 
   35: /*
   36:  * Curl_memrchr()
   37:  *
   38:  * Our memrchr() function clone for systems which lack this function. The
   39:  * memrchr() function is like the memchr() function, except that it searches
   40:  * backwards from the end of the n bytes pointed to by s instead of forward
   41:  * from the beginning.
   42:  */
   43: 
   44: void *
   45: Curl_memrchr(const void *s, int c, size_t n)
   46: {
   47:   if(n > 0) {
   48:     const unsigned char *p = s;
   49:     const unsigned char *q = s;
   50: 
   51:     p += n - 1;
   52: 
   53:     while(p >= q) {
   54:       if(*p == (unsigned char)c)
   55:         return (void *)p;
   56:       p--;
   57:     }
   58:   }
   59:   return NULL;
   60: }
   61: 
   62: #endif /* HAVE_MEMRCHR */